Tibe-vtjlcauizim-o device



F. B. PFEIFFER.

TIRE V-ULCANIZING DEVICE. APPLICATION FILED APR. 21. I921.

Reissued June 7, 1921.

INVENTOR.

Fred Ea. Pfe'rff'e'r Q1 ATTORNEY FRED BROWN PFEIFFEB, OF AKBON, QHIO.

TIBE-VULCANIZING DEVICE.

011311111180. 1,827,841, dated To all whomit may concern:

Be it known that I, FRED B. PFEIFFER, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a new and useful Tire- Vulcanizing Device, of which the following is a specification.

The device forming the subject matter of this application is adapted to be employed for curlng the casings of automobile tires, and the invention aims to provide novel means whereby the curing of the casing may be brought about without pinching or buckling the casin the necessary heat and pressure being a orded in a single operation.

It is within the province of this disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With theabove and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrange'mentof parts. and in the details of construction hereinafter described and claimed. Changes in the precise em-] bodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in side elevation, a device constructed in accordance with the invention, parts being broken awa Fig. 2 is a cross section ta on on the line 22 of Fig. 1; Fig. 3 is a fragmental section of the casing member illustrating details, which, for the sake of clearness, have been omitted in Fig. 2; Fig. 4 1s a diagrammatic elevation showing one form of means for supplying heat and pressure.

In carryin out the present invention, there is provided a rigid casing 0r sheath spaced from the tire, which may be in the form of an annular mold 1 comprising cooperatin parts 2 provided at oneend with lugs 3 unlted by a hinge 4 so that the (parts 2 of the mold may be opened and close The 0 posite ends of part 2 of the mold are supplied with lugs 5. A latch 6 of any desired construction 1s pivoted to one of the lugs 5, the other lug 5 having a notch 7 wherein the latch 6 me be received, to hold the arts 2 y P of the mold together. Vided in its interior with a circumscribing The mold 1 15 pro.

Application for re- Specification of Reissued Letters Patent. Reissued J fine 7, 192 1,"

January 1a, 1920, Serial 1&0. 233,456,111 ma 9, 1918. issue filed April 21, 1921. Serial m 468,861.

groove 8, and the mold, therefore, may be" described as being tr'oughshaped in cross- Located within 'the groove 8 of the mold- 1 and conforming closely thereto is an annular flexible casing 10 which is troughshaped in cross section, the casing embodying inner andouter walls. The inner wall of the casin 10 may be supplied, in its tread portion, wi projections 11. The inner wall of the caslng 10 'is provided, adjacent. its

edges, with inwardly projecting ribs 12.

The casing IO carries oppositely disposed nipples 14 adapted to be received in the openings 9 of the parts 2 of the mold 1. One of the nipples 14 may be connected with a conduit 15, in which is interposed a heater 16, a pressure tank, 17, a pump 18, and a valve 21, the valve 21 being located bBl'NW n the heater 16 and the tank 17 1 The casing 10' may be made of'any desired material or of any desired combination of materials, but it is desirable that the easing shall be flexible. At the same time it may be so constructed that it will conduct heat. It may be desirable to fashion the casing '10 out of layers of woven wire fabric 19 and alternating layers 20 of rubberized fabric, the constituent'layers of the casing being vulcanized to form a unitary structure.

In practical operation, the tire 22 which is to be cured is placed within the casing 10 andthe casing 10 is placed in the groove 8 of the mold 1, the nipples 14 passin through the openings 9 in the mold, and t e parts 2 of the mold being held closed by means of the latch 6 or its equivalent. A fluid which may be either a liquid or a as is delivered by the pump 18 to the tank 1% and is let into the heater 16 by opening the valve 21 to any desired degree. From the heater 16, the fluid flows by way of the conduit 15 into the interior of the casing 10, under pressure, and heated to the desired extent, the. casing thus being ex anded and being forced to grip the tire 22 c osely. The projections 11 on the casing. 10 form anti-skidding projections 23 on the tire 22, and the ribs 12 form the clencher beads 24 of the tire. It will be obcasing will be shaped as desired, de ending'upon the naturei f the tire which is ing cured.

The showing of the drawings as regards the heater 16, the tank 17 the pump 18 and the valve 21 is largely diagrammatic and may be departed from without jeopardizing the utility of the invention;

When the heated fluid is supplied under sressure through one of the nipples 14, the

uid may be permitted to pass out of the 'othernipple 14, thus securing a circulation,

the pressure being maintained, and the construction being such that a series of devices, constructed in accordance with the invention may be connected together. The fluid, under pressure, delivered within the casing 10 causes the casing to expand and to grip the tire 22 closely, outward expansion of the casi'ng being limited by the mold 1, the tire being sustained internally by a form 50. The device is so constructed that it affords the necessary heat and any desired ressure, it being possible to cure a tire casing with a device of the sort hereinbefore set forth, without pinching or buckling the casing,

a uniform pressure on the casing being se cured throughout the curing operation.

Claims 1. In a device of the class described, an annular mold; a flexible hollow annular casing disposed within the mold, the casing being trough-shaped in cross section to receive a tire, and being made partly of metal to conduct heat; means for supplying a fluid under pressure to the interior of the casing,

and means for heating the fluid prio'r to its introduction int the casin 2. In a device of the c iss described, a I

ing within the sheath adapted to receive a tire, a support for the interior of the tire, means to supply fluid under ressure to the casing and means to heat the tire while under pressure.

4. In a device of the character set forth,

an outer sheath,the interior surface of which is substantially trough-shaped in cross section, a flexible hollow casing within the sheath adapted to receive a tire, a support for the interior of the tire, means to supply fluid under pressure to the casing and means to heat the tire while under pressure.

so a

\ 5. I In an apparatus for vulcanizing tires, a

a rigid core for supporting the interior of the tire, a flexible and expansible casing on the outside of the tire, means for expanding the said casing to hold the tire under preslsluie1 and means for heating the tire while so FRED BROWN PFEIFFER. 

